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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Synthesis of g-C3N4/Nb2O5 heterostructures and their application in the removal of organic pollutants under visible and ultraviolet irradiation

Full text
Author(s):
Carvalho, Kele T. G. ; Nogueira, Andre E. ; Lopes, Osmando F. ; Byzynski, Gabriela ; Ribeiro, Caue
Total Authors: 5
Document type: Journal article
Source: CERAMICS INTERNATIONAL; v. 43, n. 4, p. 3521-3530, MAR 2017.
Web of Science Citations: 18
Abstract

This paper describes the synthesis of a new series of g-C3N4/Nb2O5 heterostructures and their application in the removal of organic pollutants from water, as a combined strategy of photocatalysis and adsorption processes. The heterostructures were synthesized at different weight ratios through thermal oxidation and hydrothermal treatment, leading to an uniform assembly of Nb2O5 nanoparticles onto g-C3N4 surface. The heterostructures exhibited improved textural and electronic properties (narrowing in band gap) when compared to pure g-C3N4 and Nb2O5, respectively. Although adsorption capacities were shown to be influenced by Nb2O5 content, g-C3N4 was essential to increase the photocatalytic response of the g-C3N4/Nb2O5 heterostructures, which displayed an enhancement of photocatalytic performance on the degradation of methylene blue and rhodamine B dyes under visible and ultraviolet irradiation. The enhanced photoactivity was explained by the increase in the lifetime of the charge carries due to formation of heterojunctions between Nb2O5 and g-C3N4. A mechanistic investigation on the photocatalytic process was conducted by using different reactive scavenger species. The superoxide (O-2(-)) radical was found to be the main active specie on the dye photodegradation activated by visible radiation. (AU)

FAPESP's process: 15/12304-0 - Evaluation of the photocatalytic activity of g-C3N4/Nb2O5 heterojunctions in the abatement of pollutants in gas phase
Grantee:Kele Tatiane Gomes Carvalho
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 14/09014-7 - STUDY OF THE POTENTIAL OF NANO-HETEROSTRUCTURE OF COPPER AND NIOBIUM OXIDE FOR USE IN ARTIFICIAL PHOTOSYNTHESIS
Grantee:André Esteves Nogueira
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 13/13888-0 - Synthesis of BiVO4/bismuth oxides nano-heterostructures and evaluation of photocatalytic properties
Grantee:Osmando Ferreira Lopes
Support type: Scholarships in Brazil - Doctorate